I wouldn’t necessarily “recommend” this, but one option is to do nothing with it. I’ve had my transponder since 1998, had it stored in the garage (in Edmonton, Alberta where it gets COLD in the winter) for 10 years when I got out of karting, pulled it out of storage and it’s worked the last 3 years as if it was new.

Honestly, I think it might be more luck of the draw than anything as to why one transponder lasts and another doesn’t.

The one thing I’ve always done is to let it run completely out of charge before re-charging it.